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The “dull” side is where the foil is in contact with another layer, while the “shiny” side is the side milled without being in contact with another sheet of metal.
Again, the function of the foil is not altered by whichever side you use, unless the foil is labeled, “non-stick.”
According to experts, an aluminum foil obtains non-stick function when a non-stick coating is applied to one of its surfaces, which is typically the “dull” side.
But this isn’t something to worry about as manufacturers typically label the side that bears the “non-stick” function.
BOTTOMLINE
If you are using an aluminum foil to prevent heat loss for quick cooking, then you don’t need to worry about what side to use. However, if you are using yours for non-stick cooking like during baking, make sure to keep an eye out for the label that designates the side that provides the non-stick function.
Happy cooking!
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